Patent US4554347A successfully refreshed from Google Patents.
US4554347A
Expired / Lapsed
US
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Microwave curing of latex-based compositions
Assignee: WR Grace and Co Conn
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Filing: 1984-11-13
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Granted: 1985-11-19
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Expires: 2004-11-13
Abstract
Abstract A method of providing cured latex-based compositions is disclosed which permits in situ curing of latexes disposed in plastic container closures or other heat sensitive receptacles without adverse effect on the closure or receptacle. The method comprises heating a fluid latex composition to gel the latex and effect removal of at least a portion of the water initially contained therein and subjecting the resultant composition to modulated microwave energy to effect curing thereof. Modulation of the microwave energy is achieved by applying same in an intermittent or pulsed fashion. The method is of particular interest for the in situ formation of cured latex-based gaskets in polyalkylene container closures.
Inventors
- 👤 J. Barry Hawkes, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:53
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; B; B29; B29C; B29C35/00; B29C35/02; B29C35/08; B29C44/00; B29C44/02; B29C44/12; B29C35/0805; B29C2035/0855; B29K; B29K2021/00; B29K2105/00; B29K2105/0058; B29K2105/0064; B29K2105/04; B29L; B29L2031/00; B29L2031/26; B29L2031/265; B29L2031/56; B29L2031/565; C08J2321/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
71 words
A process of forming a cured latex based composition comprising the steps of heating a fluid rubber latex containing a curing agent and a gelling agent to effect gelling thereof and removal of a major proportion of the water initially contained therein and subjecting the resultant gelled composition to microwave radiation to effect curing thereof, said microwave radiation being modulated to provide substantially uniform and complete curing of said gelled composition.
Claim 2
Dependent Claim
71 words
A process of forming a cured latex based composition comprising the steps of heating a fluid rubber latex containing a curing agent and a gelling agent to effect gelling thereof and removal of a major proportion of the water initially contained therein and subjecting the resultant gelled composition to microwave radiation to effect curing thereof, said microwave radiation being modulated to provide substantially uniform and complete curing of said gelled composition.
Claim 3
Dependent Claim
18 words
A process of claim 1 wherein said microwave energy is modulated by being applied in a pulsed fashion.
Claim 4
Dependent Claim
33 words
A process of claim 2 wherein the pulses of microwave radiation are about 5 to 40 seconds in duration and are applied at equally spaced intervals ranging from about 5 to 40 seconds.
Claim 5
Dependent Claim
19 words
A process of claim 3 wherein said pulses are of equal duration and are applied at equally spaced intervals.
Claim 6
Dependent Claim
20 words
A process of claim 4 wherein the pulse duration and interval time are equal and are at least 10 seconds.
Claim 7
Dependent Claim
19 words
A process of claim 1 wherein said fluid latex is heated to a temperature of at least 150° F.
Claim 8
Dependent Claim
30 words
A process of claim 6 wherein said fluid latex is heated to a temperature in the range of about 160° F. to 180° F. for about 15 to 30 minutes.
Claim 9
Dependent Claim
17 words
A process of claim 1 wherein substantially all of the water is removed from said fluid latex.
Claim 10
Dependent Claim
15 words
A process of claim 1 wherein said fluid latex is deposited on a polyalkylene substrate.
Claim 11
Dependent Claim
14 words
A process of claim 1 wherein said fluid latex is a styrene-butadiene rubber latex.
Claim 12
Dependent Claim
13 words
A process of claim 1 wherein said fluid latex comprises a naphthenic oil.
Claim 13
Dependent Claim
20 words
A process of claim 1 wherein said cured latex-based composition possesses a thickness or diameter of at least 1/8 inch.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-18 | 1989-05-20 | 1989-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-18 | 1993-05-20 | 1993-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-18 | 1997-05-20 | 1997-11-19 | $7700.00 | Window Closed / Lapsed |